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Discussion Starter #1
This deserved a separate thread because AndreasPassat and I are discussing an issue that is puzzling. He's convinced that there are two orings, and I only have one. I have one on the old one I removed, and only one came with the new one I'm about to install. It mounts on the outside of the thermostat (so you can see it when the thermostat is inserted). I didn't have any o-rings behind it, nor did the replacement thermostat come with two o-rings (just the same as I removed). What the heck is going on? AndreasPassat is always spot on, so I don't know what the heck to think. I didn't see anything fly out when I pulled the old one. I can look around. Makes no sense.
 

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Discussion Starter #2
I called VW parts. He insisted that there is only one o-ring on/around the thermostat (on the outside, as I saw when removing). AndreasPassat says he's had two on every V6 job. What the heck is going on?
 

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Discussion Starter #3
BTW, the front oring was somewhat bonded to the thermostat, and would never fall off. There was no sign of any rubber, oring, residue whatsoever on the back of the thermostat.
 

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Discussion Starter #4
If this 2nd o-ring does exist, the only thing that makes sense is that the VW dealer who did my last TB change didn't put it in. But why didn't I have leaks at the thermostat if that's the case? This holiday weekend is definitely the wrong time to be stuck on a timing belt job. :crazy:
 

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Discussion Starter #6
Only 1 O-ring on the t-stat.
THANK YOU PZ! I've been in a holding pattern for hours. I'll text your answer to AndreasPassat. I'm stunned he was incorrect, because the guy is dead on with everything. I didn't want to move forward when he was so convinced.

I'm so thankful for his help. I'm going to owe him a new car when I'm done.
 

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Discussion Starter #7 (Edited)
Ok, first up, AndreasPassat just apologized and said he was confusing with a different car (I certainly don't blame him!).

Second, so we are all on the same page, and so anyone reading this in the future understands:

Pic#1: Hole into which thermostat is installed. The lip at the beginning is where AndreasPassat thought an o-ring should go (I think), but every source, and my old one, was installed direct metal contact between lip of thermostat and the mating metal surface.

Pic#2: Thermostat installed with the only o-ring placed outside.

Pic#3: The housing mating surface, which is cinched down directly on the thermostat - no additional o-ring.

We all clear?

(EDIT: I correctly oriented the thermostat in 2nd picture, with valve on top, as mentioned in the next post - the 2nd pic is now correct).

Thermostat Installed with oring.jpg

Thermostat installed (correct orientation).jpg

Thermostat housing.jpg
 

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Discussion Starter #8 (Edited)
After watching yet ANOTHER instruction video, I realized that the thermostat above is installed upside down. That small hole is a bleed air hole or something. It wasn't mentioned in any of my instructions. Glad I accidentally caught it now!! Just to make sure that I don't mislead anyone in the future, I'll replace the pic above with the correct orientation after I go back in and spin it.

EDIT: Image now shows correct installation orientation.
 

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THANK YOU PZ! I've been in a holding pattern for hours. I'll text your answer to AndreasPassat. I'm stunned he was incorrect, because the guy is dead on with everything. I didn't want to move forward when he was so convinced.

I'm so thankful for his help. I'm going to owe him a new car when I'm done.

Yeah my fault!!
I was thinking of another car that I just worked on.
 
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